validate method

  1. @override
String? validate(
  1. String? value
)
override

Validates the value and returns an error string if it fails, or null if it passes.

Implementation

@override
String? validate(String? value) {
  if (value == null || value.isEmpty) return null;
  if (value.length < minLength) return message;
  if (requireUppercase && !RegExp(r'[A-Z]').hasMatch(value)) return message;
  if (requireLowercase && !RegExp(r'[a-z]').hasMatch(value)) return message;
  if (requireNumber && !RegExp(r'[0-9]').hasMatch(value)) return message;
  if (requireSpecialChar && !RegExp(r'[^a-zA-Z0-9]').hasMatch(value)) {
    return message;
  }
  return null;
}